鼎湖山地区马尾松年轮元素含量与酸雨的关系  

Tree\|Ring Chemical Changes and Possible Impacts of Acid Precipitation in Dinghushan, South China

作　　者：侯爱敏[1] 彭少麟[2] 周国逸[2] 

机构地区：[1]苏州科技大学资源与城市科学系,苏州215011 [2]中国科学院华南植物研究所,广州510650

出　　处：《生态学报》2002年第9期1552-1559,共8页Acta Ecologica Sinica

基　　金：国家自然科学基金重大资助项目 (3 98993 70 ) ;广东省自然科学基金重大资助项目 (980 95 2 ) ;中国科学院"九五"重大资助项目 (KZ95 1 -B1 -1 1 0 ;KZ95 T-40 -0 2 -0 3 )

摘　　要：分析了鼎湖山马尾松年轮中几种化学元素含量的历史变化 ,并探讨了区域酸雨的影响。结果表明 ,酸雨有可能导致马尾松年轮中 N、K和 Al的含量在近 3 0 a中的上升趋势 ,和 Ca、Mg和 Mn明显的下降趋势。马尾松幼年期年轮部分元素含量异常地偏高 ,可能是幼年期生理机制不完善、对元素的选择性吸收和排斥能力较低所致 ,因此 ,以马尾松幼苗为对象进行的模拟酸雨试验结果 ,在推广至成熟的马尾松林地时可能会出现较大的偏差。The objective of this paper is to examine the relations between acid rain and element content in the rings of a native species Pinus massoniana , which is sensitive to acid rain pollution in Dinghushan Nature Reserve (DNR), located in one of the areas with quickest industrial growth and severest acid rain pollution in China. Substantial decline of the pH of the precipitation and an even faster increase in the frequency of acid precipitation occurred in the last two decades in the area. We expect this to be shown in the element variations in the annual rings of Pinus massonian. The samples were collected in the pine forest at an elevation of about 250m. Four Pinus massonian trees were randomly sampled in the stand, each within 10m to the others to insure a homogeneous sampling condition. Discs of about 5cm in thickness were cut off at the height of about 1.3cm, and then polished to reveal annual growth rings. Ring width was measured using a WinDendro Image System (Regent Co. Canada). Cross\|dating was done both visually and statistically. For each disc, wood samples representing 2\|year growth intervals were cut off with a chisel. The samples were dried and ground by means of a grinding mill. Mineralization of a 1g sample was done using H 2SO 4\|HCLO 3 for total nitrogen or HNO 3\|H 2SO 4\|HCLO 3(8:1:1)for Ca, Mg, K, Na, Mn, Fe and Al. N was determined by automated ion analyzer (Quick Chem, U.S.); Ca, Mg, K, Na, Mn and Fe by atomic absorption spectrometry (GBC932AB, Australia) and Al by digital spectrophotometer (Shimadzu UV\|120\|02, Japan). The annual variations of the ring widths were generally consistent across the four trees. After removing the age\|related variations,only the short term variations were still retained, so the major cause of the long term radial growth variations of these trees can be attributed to age\|related factors. For all the elements except Al, Fe and Na, the variation pattern was fairly consistent among the four

关 键 词：鼎湖山地区 马尾松 年轮 元素含量 酸雨 

分 类 号：S718.5[农业科学—林学]